Fine blanking method and device

Abstract

The invention provides a fine blanking method. Firstly, metal materials are put into a mold composed of two dies and two punches; secondly, the lower punch and the upper die are in a locked state, and the upper punch is in zero pressure. The upper die goes down, part of the material flows into the upper die cavity; the upper die and upper punch are locked again, the lower punch is zero pressure, and when the upper die and upper punch continue to descend, part of the material flows into the lower die; finally Keep the upper punch in a locked state, set the upper die to a given pressure state to provide blank-holding force, and the lower punch to a given pressure state to provide counter pressure. When the upper punch continues to move downward, carry out continuous blanking , to complete the entire fine blanking process. The invention also provides a device for carrying out the method, equipped with an independently working annular plunger, the force generated by the annular plunger can be applied to an upper die for squeezing the waste area of ​​the fine blanking blank. The invention can greatly increase the fine-blanking limit thickness of the material to realize the fine-blanking of thick plates.

Description

technical field [0001] The invention relates to a stamping method of a sheet metal, in particular to a fine blanking method. The invention also relates to a fine blanking device for implementing the method. Background technique [0002] In the metal processing industry, a large number of sheet metal stamping processes are used, among which fine blanking technology is an advanced manufacturing technology. A single fine blanking can obtain parts with a dimensional tolerance of IT7~8 and a shear surface roughness of Ra0.8~0.4μm. Equivalent to the quality of grinding in machining. Taking a gear with a module of 3, a number of teeth of 18, and a thickness of 5 mm as an example, it takes about 6 minutes to produce each piece by machining, and more than 6 pieces can be produced per minute by fine blanking. [0003] figure 1 Shown is a schematic diagram of traditional strong blanking fine blanking, the workpiece 105 is located between the blank holder 101 , the punch 102 , the di...

AI Technical Summary

Problems solved by technology

The degree of deformation increases with the progress of the fine blanking process, and finally the plasticity is exhausted to cause tearing. Therefore, the specification of the strong blanking fine blanking process gives the maximum thickness of different materials that can be fine blanked, which greatly limits the scope of use of the fine blanking process.

Still taking the gear as an example, there is no fine blanking gear with a thickness of more than 7 mm.

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